01Separate equivalence from resemblance

Create an identity anchor before collecting names: the molecular sequence or structure, relevant modifications and the form intended by the question. A shared marketing label is weaker evidence of equivalence than a documented identity match.

For an original fictional example, suppose a paper explicitly states that AX-17 and Research Peptide Q name the same defined material. That supports connecting those two terms. A product called Q Blend does not join the same group merely because it includes the letter Q.

The distinction protects both retrieval and interpretation: an expansive search may include related candidates, but their evidence should not be silently pooled as one compound.

02Treat database synonyms as leads to verify

A primary PubChem methods paper explains that synonym filtering seeks consistency in deposited name–structure associations and cannot guarantee their correctness. A name listed in a chemical database is therefore useful discovery information, not an infallible identity certificate.PubChem authors — PubChem synonym filtering process using crowdsourcing (opens in a new tab)

Inspect the associated structure and source record where possible. If an alias points to a different stereochemistry, terminal modification, salt definition or component mixture, record that distinction rather than accepting the name match.

A review or supplier page may repeat an earlier naming error. Follow the identity assertion to the record that actually defines the material when the distinction affects your question.

03Combine alternatives without requiring them all

PubMed uses OR for alternatives and AND for required combinations; parentheses group related terms. Field tags can limit where terms are sought.NLM — PubMed User Guide (opens in a new tab)

An illustrative, unexecuted query for the fictional material is ("AX-17"[Title/Abstract] OR "Research Peptide Q"[Title/Abstract]) AND binding[Title/Abstract]. It asks for either name together with the topic in the specified searchable fields.

Using AND between the two names would require both and could miss a record using only one. Conversely, leaving a common abbreviation unrestricted can add a large amount of unrelated literature.

A title/abstract search also cannot retrieve a name appearing only in the full article’s methods or supplement. Keep that limitation in mind when a known relevant study is absent; the absence may concern searchable fields rather than identity.

04Check the search against known examples

Use a few already identified relevant records to test whether the strategy retrieves the names it is intended to cover. This is a practical diagnostic, not proof that the search captures every relevant paper.

When a known record is missed, inspect its actual wording, indexing and fields. Add a term because it resolves that specific gap, and document whether the addition also introduces a different molecular entity.

Preserve the name map alongside the exact query. Later readers should be able to distinguish an alias established by an original paper from a speculative term added to explore ambiguity.

During study selection, check the experimental material again. Search equivalence is a retrieval convenience; it does not replace the methods-level identity check required before applying a finding.